Fig. 1. Study flow chart including reasons for exclusion from analysis.
Flow chart describing patient inclusion and reasons for exclusions from analysis in the two different study periods.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.